Safety mechanism for elevators.



No. 846,386Lf- 'Y PATENTBDMAR. 5,2190?.- H. BAWDEN & W; HOSKIN.

SAFETY MEGHANISMTOR ELEVATORS.

APPLIOATION FILED 001.14. 1905.

s-sEBETs-SHEBT1- I rw: Nonkls PETERS co.. vusmNc'raN. n. c.

No. 846,386. PATENTED MAR.l 5,l 1907.

H. BAWDEN: W. HOSKIN.y

SAFETY MGHANISM POR ELBVATORS.

'APPLIQAHON FILED ocT.14,19o5.

3 SHEETS-SHEET 2.

THE NoRRIs PETERS ca., WASHINGTON. n. c,

UNITED sTATEs PATENT oEEIoE.

HERBERT BAWDEN AND WILLIAM HOSKIN, OF CENTRALy CITY, COLORADO, ASSIGNORSOF ONE-THIRD TO HERBERT C. EASTMAN.

SAFETY NIECHANISM FOR ELEVATORS.

Patented March 5, 1907.

To all whom it may concern:

Be it known that we, HERBERT BAwDEN and WILLIAM HosxIN, citizens of theUnited States, residing at Central City, in the county of Gilpin andState of Colorado, have invented certain new and useful -Improvements inSafety Mechanisms for Elevators; and we do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

This invention relates to improvements in elevators, and moreparticularly to a safety mechanism therefor,

The object of the invention is the provision of means for facilitatingthe stopping of an elevator in the event of the same descendingaccidentally.

With this and other objects in view the invention consists of certainother novel constructions, combinations, and arrangements of parts, aswill be hereinafter fully described, illustrated in the accompanyingdrawings, and more particularly pointed out in the claims heretoappended.

In the drawings, Figure 1 is a view in side elevation of a mechanismconstructed in accordance with the present invention. Fig. 2 is a frontview in elevation of the mechanism depicted in Fig. 1 Fig. 3 is a topplan view of the mechanism. Fig. 4 is an inverted plan view of themechanism, showing the bottom of the structure. Fig. 5 is an enlargedview, in side elevation, of one of the key-plates. Fig. 6 is a view inside elevation of one of the slidable locking or catch members. Fig. 7is a perspective view of the bowed projecting side plate, key-plate, anddog, with portion broken away to exhibit the structure. l

Referring to the drawings, 1 designates the platform of the cage, whichis secured to the vertical beams 2 2, preferably I -beams The 'I-beams2, Fig. 3, are each provided with two sets of parallel flanges 3 and 41,respectively. Secured near the upper end of the vertical beams of thecage is a horizontal beam 5. The vertical guides of an ordinary elevatorwell are positioned between the parallel flanges 4 4 of theI-beams 2.Bracerods 5 are secured to each end of the platform and to the verticalI-beams. Horizontal brace-rods 6 are secured near each of their ends tothe brace-rods 5 and engage the I- beams.

Slidable rods or members 7 are positioned between the flanges 3 3 of theupright beams -2 of the cage. Fixedly secured by any suitable means tothe upper end of the slidable rod 7 is a draw-head 8. The draw-head 8 ispreferably upwardly bowed intermediate its ends. A draw-head bolt 9 isslidably supported upon the cage-beam 5 andis connected centrally to thedraw-head 8. The draw-head bolt 9 is provided with an aperture 1.0,Fig. 1. The apertured structure .of the draw-head permits anordinaryliftingcable (not shown) to be secured to the drawhead bolt.Vertical posts 11 are secured at their lower ends to the draw-head 8 andextend through apertures 4formed in the cagebeam 5. These bolts arecapable of slidable movement within the cage-beam 5. Sur rounding eachof the posts 11 is yielding means-as, for instance,spring 12. Thesesprings 12 normally exert downward pressure upon the drawehead, whichpressure is overcome by the weight of the elevator, being normallysuspendedJ upon `the draw-head bolt 9. In the event of the lifting-cablebeing broken accidentally the springs l2 will instantaneously force thedraw-head 8 and the rod 7 7 downward for actuating the safety devices.

Secured upon opposite sides oftheelevator-cage are projecting-plates 13,which are bent at 14.-, Fig. 4, for spacing the mainportions from thesides of the cage. `The ends of each of the plates 13 are secured to theplatform of the cage by any suitable fastening means. Secured to thelower end of each of the slidable rods 7 is a key-plate 15, Fig. 5,which performs the function of a cam for adjusting the locking devices.Each of the keyplates 15 is provided with elongated apertures 1.6 andwith a vertical apertured extension 17. It will be noted that thesekey-plates are of wedge-shaped structure. Each of the protectingeplates13 is provided with an elongated slot 1S, which extends .longitudinallyof the protectingplate. Positioned below the platform or floor l andalso below the parallel beams 19 of the cage are parallel movable shaftsor rods 20. These shafts extend through the elongated IOO bottom of aplate 23.

apertured portions plates 13. between the sides of the cage and theprotecting-plates 13, Fig. 4. The shafts 20 not only project through theelongated apertures 1S of the protecting-plates, but also through theregistering elongated apertures 16 of the key-plates, so that when thekeyplates are vertically adjusted the shafts 2O will be movedlongitudinally within the slots 18 of the protecting-plates. Projectingoutwardly from each of the protecting-plates 13 is preferably a pair ofshafts 21. Upon each of these shafts 21 there is mounted a dog or pawl22. A washer 21 is carried'by each of the shafts or pins 21, betweenwhich and the protecting-plate 13 said dog or pawl.

is secured. Each of the shafts 2() extends through the upper portion oftwo of the dogs Horizontal movement of the shafts 2O will cause the dogs22 to be swung upon the shafts or pins 21. Upon one side of the elevatoreach shaft 20 extends through a key-plate 15, a protecting-plate 13, anda awl or dog 22. Vertical movement of the key-plates will cause theshafts 2O to be moved laterally and will consequently actuate the dogsor pawls from removing the same from engagement with the ordinaryelevator-guides between which the cage or carriage slides.

Slidable catches are carried by the cage which are adapted to beprojected beyond the sides for engaging a suitable stop-as, forinstance, a floordwhen the carriage is accidentally descending. Each ofthese slidable catches comprises a flat plate 23, which is provided withan auxiliary metallic reinforcing-plate 24. Preferably a pair ofapertured ears 25 are mounted upon each of the shafts 20 between theparallel beams 19. Each of the ears 25 is provided with a taperinghorizontal extension which engages the These ears 25 and `lates 23 areiixedly connected by any suitable fastening means-as, for instance,bolts or rivets 26. The plates 23 and 211 are bifurcated, Figs. 3 andA1, producing extensions 27, which are capable of being projected beyondthe ends of the carriage or cage for engaging a floor as the elevatordescends in the well. Blocks 28 are positioned beneath the platform 1and are iixedly secured by any suitable means-as, for instance, rivets29. These blocks limit the movement of the slidable plates whichconstitute the longitudinally-movable catch devices. A transverse beam30 is secured between the parallel longitudinal beams 19 below theplatform 1. Bowed springs 31 31 are secured centrally to the transversebeam 30. The outer ends of each of said springs engage the inner end ofa plate 23. These springs 31 not only force the slidable catchesoutward, but by reason of the connections between the plates 13 of theprotectingj 23 and the dogs or pawls 22 said dogs or The key-plates 15are positioned pawls will also be swung upontheir pivot for causing thesame to synchronously engage the guides when the longitudinal movablecatches are projected for engaging stops-as, for instance, a floor.Downward projections 32 are formed upon a plate 33, which is secured tothe bottom of each of the beams 19. Between these parallel extensions orprojections 32 parallel movable shafts or rods 20 are positioned. Theseprojections 32 limit the lateral movement of the shafts 20.

lNhen the draw-head 8 moves downward, the key-plates 15, owing to thediverging elongated slots formed therein, will cause the horizontalshafts 2O to be moved ap art, thereby sliding the outer end of theplates ,23, which is provided with the extensions 27, beyond the side ofthe carriage or cage and also cause the pawls or dogs to engage thevertical guides between which the elevator slides.

1. The combination with an elevator-car, of a draw-head carried by saidcar, a post fixedly secured at one end to said draw-head and extendingthrough a portion of said car, a spring surrounding said post, rodsfixedly secured to said draw-head, key-plates fixedly secured to saidrods, each key-plate provided with diverging elongated apertures,movable, horizontal shafts positioned within the apertured portions o'said key-plates, and pivoted dogs carried by said car and engaging andcooperating with said shafts.

2. The combination with an elevator-car, of outwardly-bowedprotecting-plates carried by said car, a movable shaft vcarried by saidcar and supported upon said protectingplates, dogs carried by said carand engaging and cooperating with said shaft, and means positionedbetween said protecting-plates and car and being capable of moving saidshaft laterally for actuating said dogs.

3. The combination with an elevator-car, of spaced plates carriedrigidly by the car and provided each with a horizontal slot, platesmovably mounted adjacent the rigid plates and provided with inclinedslots, shafts extending through the horizontal and inclined slots, pawlscarried by the shafts and pivoted upon the rigid plates, and means tomove the movable plates.

4. The combination with an elevator-car, of spaced plates carriedrigidly by the car and provided each with a horizontal slot, platesmovably mounted adjacent the rigid plates and provided with slotsreversely inclined from the vertical, shafts extending through thehorizontal and inclined slots, pawls carried by the shafts and pivotedupon the rigid plates, and means to move the movable plates.

5. The combination with an elevator-car, of spaced plates carriedrigidly by and at op- IOO posite sides of the car, and provided eachwith a horizontal slot, plates movably mounted adjacent the rigid platesand provided with inclined slots registering with the horizontal slots,shafts extending through the horizontal and inclined slots, pawlscarried by the shaft and pivoted 'upon the rigid plates, and means tomove the movable plates. 4

6. The combination with an elevator-car, of spaced plates carriedrigidly by and at opposite sides of the car, and provided each with ahorizontal slot, plates mounted adj acent the rigid plates and providedwith inclined slots registering with the horizontal slots, shaftsdisposed transversely of the car and extending through the registeringhorizontal and inclined slots, pawls carried by the shafts and pivotedupon the rigid plates, and means to move the movable plates.

7. The combination with an elevator-car, of spaced plates carriedrigidly by and at opposite sides of the car and provided each with ahorizontal guide-slot, plates movably mounted adjacent the rigid platesand provided with guide-slots reversely inclined from they vertical andregistering with the horizontal uide-slots, shafts disposed transversely of tIIe car and extending through the horizontal and inclinedslots, pawls carried upon the extended ends of the shafts and pivotedupon the rigid plates, and means to move the movable plates vertically.

8. The combination of an elevator-car, a protecting-plate carried by thecar` and spaced therefrom, a slidably-mounted keyplate interposedbetween the car and the protecting-plate, a shaft movably mounted on thecar and protecting-plate and loosely connected to the key-plate, a catchhaving operative connection with the shaft, and means for actuating thekey-plate to control the catch.

9. The combination of an elevator-car, a protecting-plate carried by thecar and spaced therefrom, a slidably-mounted keyplate interposed betweenthe car and the protecting-plate, the said key-plate being formed withan elongated opening, a shaft passing through the elongated opening inthe keyplate and movably mounted upon the car and protecting-plate, acatch having an operative connection with the shaft, and means foractuating the key-plate to control the catch.

In testimony whereof we aiiix our signatures in presence of twowitnesses.

HERBERT BAWDEN. WILLIAM HOSKIN. Witnesses:

JAs. R. RULE, A. N. SMooK.

